Thank you for using the SPA’s Forum, and we are glad that you find it useful. We know that not everyone here is a current member of the SPA, and there has never been a requirement to be a member to take part in the discussions. However, as one of the services offered by the SPA, the Forum does cost us time and money to keep running, and so we hope that all who benefit from its existence will consider paying the very reasonable sum to become a member of the Society! You can visit our joining page here: https://www.popastro.com/main_spa1/join-the-spa-now/